CommonData.cpp

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/*
        This file is part of cpp-ethereum.

        cpp-ethereum is free software: you can redistribute it and/or modify
        it under the terms of the GNU General Public License as published by
        the Free Software Foundation, either version 3 of the License, or
        (at your option) any later version.

        cpp-ethereum is distributed in the hope that it will be useful,
        but WITHOUT ANY WARRANTY; without even the implied warranty of
        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        GNU General Public License for more details.

        You should have received a copy of the GNU General Public License
        along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
*/
#include "CommonData.h"
#include <random>

#if defined(_MSC_VER)
#pragma warning(push)
#pragma warning(disable:4724) // potential mod by 0, line 78 of boost/random/uniform_int_distribution.hpp (boost 1.55)
#endif
#include <boost/random/uniform_int_distribution.hpp>
#if defined(_MSC_VER)
#pragma warning(pop)
#endif
#include "Exceptions.h"
#include "Log.h"
using namespace std;
using namespace dev;

namespace
{
int fromHexChar(char _i) noexcept
{
        if (_i >= '0' && _i <= '9')
                return _i - '0';
        if (_i >= 'a' && _i <= 'f')
                return _i - 'a' + 10;
        if (_i >= 'A' && _i <= 'F')
                return _i - 'A' + 10;
        return -1;
}
}

bool dev::isHex(string const& _s) noexcept
{
        auto it = _s.begin();
        if (_s.compare(0, 2, "0x") == 0)
                it += 2;
        return std::all_of(it, _s.end(), [](char c){ return fromHexChar(c) != -1; });
}

std::string dev::escaped(std::string const& _s, bool _all)
{
        static const map<char, char> prettyEscapes{{'\r', 'r'}, {'\n', 'n'}, {'\t', 't'}, {'\v', 'v'}};
        std::string ret;
        ret.reserve(_s.size() + 2);
        ret.push_back('"');
        for (auto i: _s)
                if (i == '"' && !_all)
                        ret += "\\\"";
                else if (i == '\\' && !_all)
                        ret += "\\\\";
                else if (prettyEscapes.count(i) && !_all)
                {
                        ret += '\\';
                        ret += prettyEscapes.find(i)->second;
                }
                else if (i < ' ' || _all)
                {
                        ret += "\\x";
                        ret.push_back("0123456789abcdef"[(uint8_t)i / 16]);
                        ret.push_back("0123456789abcdef"[(uint8_t)i % 16]);
                }
                else
                        ret.push_back(i);
        ret.push_back('"');
        return ret;
}

std::string dev::randomWord()
{
        static std::mt19937_64 s_eng(0);
        std::string ret(boost::random::uniform_int_distribution<int>(1, 5)(s_eng), ' ');
        char const n[] = "qwertyuiop";//asdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM1234567890";
        boost::random::uniform_int_distribution<int> d(0, sizeof(n) - 2);
        for (char& c: ret)
                c = n[d(s_eng)];
        return ret;
}

bytes dev::fromHex(std::string const& _s, WhenError _throw)
{
        unsigned s = (_s.size() >= 2 && _s[0] == '0' && _s[1] == 'x') ? 2 : 0;
        std::vector<uint8_t> ret;
        ret.reserve((_s.size() - s + 1) / 2);

        if (_s.size() % 2)
        {
                int h = fromHexChar(_s[s++]);
                if (h != -1)
                        ret.push_back(h);
                else if (_throw == WhenError::Throw)
                        BOOST_THROW_EXCEPTION(BadHexCharacter());
                else
                        return bytes();
        }
        for (unsigned i = s; i < _s.size(); i += 2)
        {
                int h = fromHexChar(_s[i]);
                int l = fromHexChar(_s[i + 1]);
                if (h != -1 && l != -1)
                        ret.push_back((byte)(h * 16 + l));
                else if (_throw == WhenError::Throw)
                        BOOST_THROW_EXCEPTION(BadHexCharacter());
                else
                        return bytes();
        }
        return ret;
}

bytes dev::asNibbles(bytesConstRef const& _s)
{
        std::vector<uint8_t> ret;
        ret.reserve(_s.size() * 2);
        for (auto i: _s)
        {
                ret.push_back(i / 16);
                ret.push_back(i % 16);
        }
        return ret;
}

std::string dev::toString(string32 const& _s)
{
        std::string ret;
        for (unsigned i = 0; i < 32 && _s[i]; ++i)
                ret.push_back(_s[i]);
        return ret;
}